Browse Publications Technical Papers 2006-01-0202
2006-04-03

The Development of Throttled and Unthrottled PCI Combustion in a Light-Duty Diesel Engine 2006-01-0202

Present-day implementations of premixed compression ignition low temperature (PCI) combustion in diesel engines use higher levels of exhaust gas recirculation (EGR) than conventional diesel combustion. Two common devices that can be used to achieve high levels of EGR are an intake throttle and a variable geometry turbocharger (VGT). Because the two techniques affect the engine air system in different ways, local combustion conditions differ between the two in spite of, in some cases, having similar burn patterns in the form of heat release. The following study has developed from this and other observations; observations which necessitate a deeper understanding of emissions formation within the PCI combustion regime.
This paper explains, through the use of fundamental phenomenological observations, differences in ignition delay and emission indices of particulate matter (EI-PM) and nitric oxides (EI-NOx) from PCI combustion attained via the two different techniques to flow EGR. PCI attained via the use of a VGT to flow EGR, i.e. unthrottled PCI, has significantly less EI-PM emissions than PCI attained via the use of a throttle to flow EGR, i.e. throttled PCI. To complete the analysis, emission indices of carbon monoxide (EI-CO) and hydrocarbons (EI-HC) and performance parameters are used to differentiate the application of the two techniques on the studied engine.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Analysis of Factors Influencing Particulate Matter Emissions of a Compression-Ignition Direct-Injection Engine

1999-01-3492

View Details

TECHNICAL PAPER

In-Cylinder and Exhaust Soot in Low-Temperature Combustion Using a Wide-Range of EGR in a Heavy-Duty Diesel Engine

2007-01-4017

View Details

TECHNICAL PAPER

A Stochastic Combustion Model of Direct Injection Diesel Engines

912354

View Details

X